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Author Topic: diagonal lower rails  (Read 19488 times)

Offline wideopen231

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diagonal lower rails
« on: March 13, 2013, 08:39:56 PM »
Need to know what most have in lower frame for diagonals. Ive seen some that have nothing and wondering how mcuh they effect how chassis works.If I do install them Im thinking 3/4" should be more than strong enough,  Maybe Roo Man can chime in.
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Offline wideopen231

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Re: diagonal lower rails
« Reply #1 on: March 13, 2013, 09:55:17 PM »
I thinki I found out part of answer while veiwing some photos of Scott Parks car from year before last when he won SWJFA championship.  Still would loike input from others.
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Offline masracingtd1167

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Re: diagonal lower rails
« Reply #2 on: March 19, 2013, 10:34:58 AM »
Chris I borrowed a picture from Chuck I hope he dosn't mind . Is this what you mean . Mine has one similar to this about a foot in front of the motor and that's it My chassis is very very flexible
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Offline slingshot383

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Re: diagonal lower rails
« Reply #3 on: March 19, 2013, 04:43:44 PM »
That looks good, would be even better if it continued forward and finished the X.
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Offline ricardo1967

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Re: diagonal lower rails
« Reply #4 on: March 19, 2013, 05:27:09 PM »
Quote from: slingshot383 on March 19, 2013, 04:43:44 PM
That looks good, would be even better if it continued forward and finished the X.

I’d personally think in avoiding the ‘X’ bracing on the sides, as it'd add undesirable rigidity on the vertical plane of the chassis. My nostalgia 173" FED has no bracing (diagonal or ‘X’) from the front motor-plate forward, just ‘empty rectangles’.
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Offline wideopen231

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Re: diagonal lower rails
« Reply #5 on: March 20, 2013, 02:00:41 PM »
Yea Im thinking of going right to left then left to right in next bay.  I do not want to make chassis stiff would counter act the work I put into slipjoint. 

Had a bad experiance with a funnycar chassis that had update and went from a top 4 car to a DNQ and almost 2 dnq's before we cut bars and it sounded like tuning fork. Next run it went back to #2 qualifier on early shutoff.Kind of makes you leary of overly stiff chassis,especailly in new car and your first FED chassis build from ground up.
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Offline slingshot383

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Re: diagonal lower rails
« Reply #6 on: March 20, 2013, 02:32:38 PM »
That was between the lower tubes, not the lower and upper, making an X between the two lower tubes prevents the car wandering around going down the track and nothing about it's ability to arch up.
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Offline Larry Gocha

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Re: diagonal lower rails
« Reply #7 on: March 20, 2013, 02:38:25 PM »
masracingtd1167 do you have any more of the chassis pics you borrowed from Chuck it looks pretty nice.
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Offline masracingtd1167

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Re: diagonal lower rails
« Reply #8 on: March 20, 2013, 03:01:40 PM »
Larry chuck's user name on this forum is coupmerc . He has a brand new Neil and Park's car and it is awesom looking absolute state of the art F.E.D. He has a whole album over on the HAMB . Hey Chuck post some more pictures.
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Offline GlennLever

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Re: diagonal lower rails
« Reply #9 on: March 20, 2013, 05:03:57 PM »
Here are some, I hate to keep posting pictures of my dragster, I do not want people to get the wrong idea.













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Offline wideopen231

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Re: diagonal lower rails
« Reply #10 on: March 20, 2013, 05:25:44 PM »
Hey Glen Keep posting.  Loving it make me feel better and better about my chassis.  I  feels almost like I am looking at it in your pic. I did pick up on cpl things a little different but not much. Looks like your chassis is 2.2C spec also.   Great pics.
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Offline GlennLever

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Re: diagonal lower rails
« Reply #11 on: March 20, 2013, 09:27:03 PM »
Quote from: wideopen231 on March 20, 2013, 05:25:44 PM
Hey Glen Keep posting.  Loving it make me feel better and better about my chassis.  I  feels almost like I am looking at it in your pic. I did pick up on cpl things a little different but not much. Looks like your chassis is 2.2C spec also.   Great pics.

All Roo Man's work
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Offline slingshot383

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Re: diagonal lower rails
« Reply #12 on: March 21, 2013, 02:49:47 PM »
Using the sleeves for the uprights I see, very nice......
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Offline masracingtd1167

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Re: diagonal lower rails
« Reply #13 on: March 21, 2013, 03:13:18 PM »
Glen Keep posting your pictures we enjoy them and all the other guy's builds. One thing I have alway's wanted to do is build my own dragster . Don't get me wrong I love my Park's car but I would like to say I built one myself .
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Offline GlennLever

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Re: diagonal lower rails
« Reply #14 on: March 21, 2013, 04:46:02 PM »
Quote from: wideopen231 on March 20, 2013, 05:25:44 PM
Hey Glen Keep posting.  Loving it make me feel better and better about my chassis.  I  feels almost like I am looking at it in your pic. I did pick up on cpl things a little different but not much. Looks like your chassis is 2.2C spec also.   Great pics.

Yes, 2.2C
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